8777777556553 has 2 divisors, whose sum is σ = 8777777556554. Its totient is φ = 8777777556552.

The previous prime is 8777777556547. The next prime is 8777777556617. The reversal of 8777777556553 is 3556557777778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5501051266624 + 3276726289929 = 2345432^2 + 1810173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8777777556553 is a prime.

It is a super-2 number, since 2×8777777556553² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8777777559553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4388888778276 + 4388888778277.

It is an arithmetic number, because the mean of its divisors is an integer number (4388888778277).

Almost surely, 2^{8777777556553} is an apocalyptic number.

It is an amenable number.

8777777556553 is a deficient number, since it is larger than the sum of its proper divisors (1).

8777777556553 is an equidigital number, since it uses as much as digits as its factorization.

8777777556553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10588410000, while the sum is 79.

The spelling of 8777777556553 in words is "eight trillion, seven hundred seventy-seven billion, seven hundred seventy-seven million, five hundred fifty-six thousand, five hundred fifty-three".